2nd Option which is preferred by a friend of mine..........he wants to drill a hole to fit the projector pole through to attic and then attach pole mount assembly to trusses...........seal around the pole with acoustic caulk. I advised him I'd prefer to attach to trusses with IB-4 chips to dampen............but he insists that is not the way to go.

Option one, just screw to the ceiling assembly as is, forget about all this extra blocking you are thinking about. If you would sleep better go up in the attic and attach another layer of plywood beteen the joists and and channel on the attic side of the existing OSB.

Option two follow your friends advice. It will result in a mount that is isolated from the ceiling and is as stable as your roof truss system. Forget about isolation clips. If you are able to shake your ceiling with your sub-woofers this may be the best solution. I'm usually building in basements and the reason I don't attach projectors to ceiling joists is it makes them more susceptible to floor bounce vibration.

Option one, just screw to the ceiling assembly as is, forget about all this extra blocking you are thinking about. If you would sleep better go up in the attic and attach another layer of plywood beteen the joists and and channel on the attic side of the existing OSB.

Option two follow your friends advice. It will result in a mount that is isolated from the ceiling and is as stable as your roof truss system. Forget about isolation clips. If you are able to shake your ceiling with your sub-woofers this may be the best solution. I'm usually building in basements and the reason I don't attach projectors to ceiling joists is it makes them more susceptible to floor bounce vibration.

I like option two but worry about future placement for new toys.................

The set screw for the pole (length TBA) would be up in the attic...............a screw-up in pole length department has me more worried than anything else, not to mention having to move mount due to projector change. Right now R-21 in in the ceiling with another 8-10'' of blown insulation coming soon which requires I make the decision real soon.

From the onset...........I maticulously have planned this build out, but second guessing myself is becoming a common ritual.